Crank-shaft grinder



CRANK SHAFT GRINDER Filed April 30, 1-926 Zlmnntw are Patented Feb. 28,1928.,

WILLIAM G. FAGLIE, on onnron, 'rEXAs.

CRANK-SHAFT GRINDER.

Application fi led April 30, 1926. Serial No. 105,755.

This invention relates to new and useful.

. improvements in crank shaft grinders.

The object of the invention is to provide a tool for grinding thebearing surfaces of 5. a crank shaft to a true circular circumfer vence.

A further object of the invention is to provide means for use inconnection with the tool for finishing and polishing the bearingsurfaces which have been ground.

A particular object of the invention is to provide a pair ofsemicircular grinding members having curvilinear abrading faces for engaing the workand conforming to' the arc of the bearing.

A construction designed to carry out the invention will be hereinafterdescribed together with other features of the invention.

The invention will be more readily understood from a reading of thefollowing specification and by reference to the accompanying drawings,in which an example of the invention is shown'and wherein: v v I Flg. 11s a longitudinal sectional view invention,

Fig. 2 is a plan'view of the same with a portion in section,

Fig. 3 is a perspective view of grinding sectors, and

Fig. 1 is a transverse sectional view of the tool used as a finisher.

In the drawings, the numeral 10 designates an arcuate yoke having acentral tubular handle 11 extending from its convex side. The yoke hasspaced cars 12 at each end. An arcuate keeper 13, complementary to theyokehas ears 14 at each end engaging between the ears 12. At one side ofthe frame "01' head formedby the yoke and keeper, the

I one of the ears areconnected by a rivet 15,,whereby I the said keeperis hinged to the yoke; while at the other .side a bolt "16 passedthrough the ears is secured by'a wing nut 17, thus latching the partstogether.

- Within the head a pair of semicircular grinding sectors 18 and 19,respectively, are mounted, thelr curvature corres onding gen erally tothe curvature of the yo e and keeper. The sector 18 has a sump or socket18 at of a tool constructed in accordance with'my finished. p s Sectorsfor different diameters may, of 1 V course, be provided. The tool issimple, efii thecenter of its back for receiving t e reduced end of anadjusting stem 20 screwthreaded in the tubular handle 11 and having. agrip 21 on its outer end. The sector 19 has a sump or socket 19 at thecenter of its back for receiving an adjusting screw 22 threaded throughthe keeper.

Each sector hasits'ooncaved face provided I with grinding serrations oris "otherwise. formed for carrying out a grlndlng opera.- 6o 'tion, whenrotated. The sectors are adjustable towardeaoh other by means of thestem 20 and screw 22, and by which latter said sector may be pressedagainst the work.

'In using thetool the nut 17 is removed 6 and the bolt 16 withdrawn,wlierebythe,

keeper. 13 may be swung outwardly as is shown in dotted lines in Fig. 1.'Theparts are engaged around'the bearing element A of the crank shaft,which isillustrated as having a fiat portion B, and are secured by thebolt 1,6. The stem 20 and screw 22' are adjusted to bring the grindingfaces of the sectors into contact with the bearing and the handle 11 isthen grasped and the tool i A swung or rotated. As thesurface is groundthe sectors are adjusted and the grinding continued until the bearingsurface is brought to a true circle.

It'will be understood that the concave 30 grinding surfaces of thesectors are like files and may vary in degrees ofcoarseness or fineness.After the grinding operationis complete the head of the tool is openedand the sectors removed. Other sectors 18 and 5 I 19 (Fig. 41), havingstrips of emery cloth g or other abrading material on their con. cavedfaces, are inserted in the tool and the bearing element A is thenpolished and cient and easy to operate.

Various changes-in the size and shape of the differentparts, as well as]modifications and alterations, may be made Within the scope'of theappended'claim,

' What I claim, is:

A -crank shaft grin ding tool comprising an arcuate yoke havinganelongated tubular v handle extended centrally therefrom, a stem the axisof the screw, a second semi-circularv screw threaded into said handleand extendgrinding sector disposed in the keeper, and 10 ing through theyoke, operating means for an adjusting screw threaded into the keeperthe screw at the free end of the'handle, a in alineinent with thestemscrew and engag- 1 f semi-circular grinding sector disposed in ingthe second sector. the yoke and engaging the inner end of said v Intestimony whereof I ai'fix my signature.

screw, an arcuate keeper hinged and latched v V v e to the yoke in aplane at a right angle to 7 WILLIAM G. FAGLIE. I I

